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From: daniel@bigwalter.net (Daniel Jensen)
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Subject: Re: elisp from CL transition guide
Date: Thu, 16 Aug 2007 14:43:12 +0200
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Tamas Papp <tkpapp@gmail.com> writes:

> One thing I don't understand yet is namespaces in Elisp: if I set fill-column in
> a buffer (setq fill-column 80), that doesn't seem to affect fill-column in other
> buffers.  But if I set some other variable eg (setq foo 12), foo will evaluate
> to 12 in other buffers.  What would be a correct mental model for this?

Think of it as a special kind of scoping; buffer-local scoping. To read
more, see the Elisp manual in (info "(elisp) Buffer-Local Variables").

You can see whether a variable is buffer-local when you describe it with
C-h v (describe-variable).